How is “so long” used?

In The Invisible Man (2020), one line is: “But um that can only go on for so long so”

Which movie is “so long” from?

The clip at the top of this page is from The Invisible Man (2020).

for such a long time, or for longer than expected; goodbye

informal · Se oye en 219 películas

Definición editorial80% de las películas
for such a long time, or for longer than expected
Oxford15% de las películas
goodbye

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

But um that can only go on for so long so

En 8 películas · n.º 1